From 99ae610f0ae3608a12c864caedf396f14e68327d Mon Sep 17 00:00:00 2001
From: Maximilian Bosch <maximilian@mbosch.me>
Date: Fri, 19 Feb 2021 19:44:21 +0100
Subject: [PATCH] Implement read-only mode for ssids
With this change it's possible to define `network=`-sections in a second
config file specified via `-I` without having changes written to
`/etc/wpa_supplicant.conf`.
This is helpful on e.g. NixOS to allow both declarative (i.e. read-only)
and imperative (i.e. mutable) networks.
---
wpa_supplicant/config.h | 2 +-
wpa_supplicant/config_file.c | 5 +++--
wpa_supplicant/config_none.c | 2 +-
wpa_supplicant/config_ssid.h | 2 ++
wpa_supplicant/wpa_supplicant.c | 8 ++++----
5 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/wpa_supplicant/config.h b/wpa_supplicant/config.h
index 6a297ecfe..adaf4d398 100644
--- a/wpa_supplicant/config.h
+++ b/wpa_supplicant/config.h
@@ -1614,7 +1614,7 @@ const char * wpa_config_get_global_field_name(unsigned int i, int *no_var);
*
* Each configuration backend needs to implement this function.
*/
-struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp);
+struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp, int ro);
/**
* wpa_config_write - Write or update configuration data
diff --git a/wpa_supplicant/config_file.c b/wpa_supplicant/config_file.c
index 77c326df5..d5ed051b9 100644
--- a/wpa_supplicant/config_file.c
+++ b/wpa_supplicant/config_file.c
@@ -373,7 +373,7 @@ static int wpa_config_process_blob(struct wpa_config *config, FILE *f,
#endif /* CONFIG_NO_CONFIG_BLOBS */
-struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp)
+struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp, int ro)
{
FILE *f;
char buf[512], *pos;
@@ -415,6 +415,7 @@ struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp)
while (wpa_config_get_line(buf, sizeof(buf), f, &line, &pos)) {
if (os_strcmp(pos, "network={") == 0) {
ssid = wpa_config_read_network(f, &line, id++);
+ ssid->ro = ro;
if (ssid == NULL) {
wpa_printf(MSG_ERROR, "Line %d: failed to "
"parse network block.", line);
@@ -1591,7 +1592,7 @@ int wpa_config_write(const char *name, struct wpa_config *config)
}
for (ssid = config->ssid; ssid; ssid = ssid->next) {
- if (ssid->key_mgmt == WPA_KEY_MGMT_WPS || ssid->temporary)
+ if (ssid->key_mgmt == WPA_KEY_MGMT_WPS || ssid->temporary || ssid->ro)
continue; /* do not save temporary networks */
if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt) && !ssid->psk_set &&
!ssid->passphrase)
diff --git a/wpa_supplicant/config_none.c b/wpa_supplicant/config_none.c
index 2aac28fa3..02191b425 100644
--- a/wpa_supplicant/config_none.c
+++ b/wpa_supplicant/config_none.c
@@ -17,7 +17,7 @@
#include "base64.h"
-struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp)
+struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp, int ro)
{
struct wpa_config *config;
diff --git a/wpa_supplicant/config_ssid.h b/wpa_supplicant/config_ssid.h
index d5c5c00a9..fd80c079c 100644
--- a/wpa_supplicant/config_ssid.h
+++ b/wpa_supplicant/config_ssid.h
@@ -93,6 +93,8 @@ struct wpa_ssid {
*/
int id;
+ int ro;
+
/**
* priority - Priority group
*
diff --git a/wpa_supplicant/wpa_supplicant.c b/wpa_supplicant/wpa_supplicant.c
index 911d79d17..cb0cb99b1 100644
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -1052,14 +1052,14 @@ int wpa_supplicant_reload_configuration(struct wpa_supplicant *wpa_s)
if (wpa_s->confname == NULL)
return -1;
- conf = wpa_config_read(wpa_s->confname, NULL);
+ conf = wpa_config_read(wpa_s->confname, NULL, 0);
if (conf == NULL) {
wpa_msg(wpa_s, MSG_ERROR, "Failed to parse the configuration "
"file '%s' - exiting", wpa_s->confname);
return -1;
}
if (wpa_s->confanother &&
- !wpa_config_read(wpa_s->confanother, conf)) {
+ !wpa_config_read(wpa_s->confanother, conf, 1)) {
wpa_msg(wpa_s, MSG_ERROR,
"Failed to parse the configuration file '%s' - exiting",
wpa_s->confanother);
@@ -5638,7 +5638,7 @@ static int wpa_supplicant_init_iface(struct wpa_supplicant *wpa_s,
#else /* CONFIG_BACKEND_FILE */
wpa_s->confname = os_strdup(iface->confname);
#endif /* CONFIG_BACKEND_FILE */
- wpa_s->conf = wpa_config_read(wpa_s->confname, NULL);
+ wpa_s->conf = wpa_config_read(wpa_s->confname, NULL, 0);
if (wpa_s->conf == NULL) {
wpa_printf(MSG_ERROR, "Failed to read or parse "
"configuration '%s'.", wpa_s->confname);
@@ -5646,7 +5646,7 @@ static int wpa_supplicant_init_iface(struct wpa_supplicant *wpa_s,
}
wpa_s->confanother = os_rel2abs_path(iface->confanother);
if (wpa_s->confanother &&
- !wpa_config_read(wpa_s->confanother, wpa_s->conf)) {
+ !wpa_config_read(wpa_s->confanother, wpa_s->conf, 1)) {
wpa_printf(MSG_ERROR,
"Failed to read or parse configuration '%s'.",
wpa_s->confanother);
--
2.29.2